Malicious PDF — malware analysis report

Static analysis result for SHA-256 f840487e560f1c25…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 20:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9455acbb0c6fc92727c38fedc2eec73 SHA-1: d7e0e70bc0c34510b39c1eecb676d387bef63d02 SHA-256: f840487e560f1c258ff72a7bb23d22b768c883ccf8e2d0131b1e6ef9d43d1dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=island+app+android PDF link annotation
    • https://vayamcs.com/content_files/files/52902737839.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/84915290704.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/96414580298.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/50260702288.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/22355426501.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109042104588798.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/tukejo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613074ce64aee---kumowiparofagevat.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/15441564265.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/19447932006.pdfIn PDF document text
    • http://carbontuning.ru/file/sovize.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/zufotat.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipokomixemazujonoraf.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/gudegenuzimumom.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210916013225.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28436208622.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/vubuxemukijunavuzadajek.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e01e3c91---67635707880.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/49369862521.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/69615748525.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/99022026203.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/82669639543.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/44855424224.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88251660593.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/tufisuvifazozumane.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f7cbf016---5287428354.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/22692501035.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 17180 bytes
SHA-256: 0bdb8d991bd560488f2212d46cf42bafd0f3e17e67c8695ed44eb2f28dfdfdac
font_01_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10108 bytes
SHA-256: 61aebcee35ca1d401cf64bc4f831c6d9814bea64862899f4e1e0af530efb59c2
font_02_sfnt_off00013571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.